David Tomlinson (the actor who starred in Mary Poppins,
Bedknobs and Broomsticks, the Love Bug etc) had an autistic son,
whose diagnosis and education is mentioned in some detail in
Mr Tomlinson's autobiography Luckier than Most.

Autistic individuals who have become well-known through their
writing and/or speaking on their experiences:

Occasionally there is speculation as to whether some particular
well-known person is autistic, e.g. an author, scientist, or
mathematician known to be unsocial and very focused.
For example, there is an audiotape
called Was Einstein Autistic?
(see Bibliography Section)

However, despite such speculation, these people in general
could socialize in ways far advanced of typical autistic behavior:
eye contact, etc.
A theory currently in vogue is that autism is
a severe variant of a mild condition that causes people
to lack social skills:
the book Shadow Syndromes expands on this theme.
It is probable that nearly all famous people occasionally cited
as being possibly autistic fall more naturally under such a milder
classification.

One of the most convincing cases I've heard of a famous person
being truly autistic was in regards to Canadian pro golfer
Moe Norman. There is a biography of him: The Feeling of
Greatness, the Moe Norman Story by Tim O'Connor.